Definitely contact Awesome Caribbean Weddings. I'm getting married in St. Lucia in June and they have been very easy to work with and promptly respond to my emails. Even though I wanted a destination wedding I didn't want a cookie cutter resort wedding where I had such limited choices (ie. flowers option A or B ). Working with Michelle I have had full control over what I want.
From my research, it is cheaper to stay in the north which is where Windjammer is located. The main area in the north where there are a lot of restaurants and things is called Rodney Bay, Windjammer isn't within walking distance of Rodney Bay but it wouldn't be a long taxi ride! I was originally really hoping to get married with a view of the Pitons but it just wasn't feasible to stay in the north and get married in the south (and it was a more money to ask my guests to pay for accomodations in the south). The car ride is more than an hour over very bumpy and narrowly winding roads. My wedding planner did offer me an option to rent a Catamaran to transport everyone to and from the wedding but the expense of the Catamaran on top of a more expensive ceremony location just didn't make sense for us.
We almost stayed at Bay Gardens Beach Resort - within walking distance to Rodney Bay. They do have an all-inclusive option but we were not going to chose this since we would have been so close to all of the restaurants. We ended up renting private villas in the north for our acommodations. Our ceremony is at the Cliff View location and our reception will be at Beach Club 1461. I know that even without that Piton view our wedding will still be what we want! I've done a TON of research so let me know if you have any other questions!